Question

.............................................,..,,,,,,,,,,,,,

Answer 1

ОТВЕТ:2k2-2k+1/k-1
.....................................

Answer 2

$\frac{1}{k - 1} + 2k = \frac{2k(k - 1) + 1}{k - 1} = \frac{2k {}^{2} - 2k + 1 }{k - 1}$